The Additel 226 and the Additel 227 are the recommended replacements
The Additel ADT 221A multifunction temperature calibrator is a highly integrated, ultra-compact, and easy to use hand-held device for sourcing, simulating, and measuring temperature and electrical signals. It is ideal for calibrating, maintaining, and troubleshooting process instrumentation. The smart phone-like menu and interface simplifies operation and offers a variety of automation and documentation capabilities such as user defined tasks and tests.
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